Steel 28NiCrMoV8-5
EN 28NiCrMoV8-5
28NiCrMoV8-5 (1.6932) is a Ni-Cr-Mo-V rotor steel supplied under the EN 10083/10250 forging family, quenched and tempered to strength classes from +QT700 to +QT1000 and optionally nitrided.
Reference datasheet — 28NiCrMoV8-5 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the +QT800 condition
28NiCrMoV8-5 tempers and conditions
28NiCrMoV8-5 is supplied in 8 conditions, soft to hard. +QT800 is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Supply condition for rough machining of forgings before final quench and temper. | 420 | 640 | 22 | 200 HB | — |
Normalized | Grain-refining intermediate treatment after forging; rarely a final delivery condition. | 560 | 850 | 15 | 25 HRC | 7.5 % IACS |
Normalized and tempered | Used for very large sections where full through-quenching is not achievable. | 560 | 780 | 17 | 22 HRC | 7.6 % IACS |
Quenched and tempered, 700–850 MPa class | Lower-strength temper for very thick rotor bodies and best toughness / lowest FATT. | 620 | 780 | 19 | 22 HRC | — |
+QT800Default Quenched and tempered, 800–950 MPa class | Standard delivered condition for turbine/generator rotors and heavy shafts: balanced strength and toughness. | 720 | 880 | 16 | 27 HRC | — |
+QT + gas nitrided | Pick when journals or sealing surfaces need wear and fretting resistance without loss of core toughness (V content gives good nitriding response). | 720 | 880 | 15 | 60 HRC | 7.5 % IACS |
Quenched and tempered, 900–1050 MPa class | Higher-strength temper for medium-section shafts, discs and highly loaded couplings. | 830 | 980 | 14 | 31 HRC | — |
Quenched and tempered, 1000–1150 MPa class | Maximum-strength temper for small-diameter bars and highly stressed fasteners/blades roots; toughness margin is reduced. | 930 | 1,080 | 12 | 35 HRC | — |
What is 28NiCrMoV8-5?
28NiCrMoV8-5 (1.6932) is a Ni-Cr-Mo-V rotor steel supplied under the EN 10083/10250 forging family, quenched and tempered to strength classes from +QT700 to +QT1000 and optionally nitrided. In the default condition it provides about 720 MPa yield, 880 MPa tensile, 16 % elongation and 270 HB (27 HRC) with service to roughly 400 °C, which suits large turbine shafts and rotors that need uniform properties through heavy sections. Weldability is poor (CE > 0.9) and machinability moderate (45), and heavy forgings require hydrogen-removal treatment; 33NiCrMoV14-5 is the nearest alternative where higher strength is needed. 28NiCrMoV8-5 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F). 28NiCrMoV8-5 has a yield strength of 720 MPa (104 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 82% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
What is 28NiCrMoV8-5 used for?
- Turbine rotors
- Turbine shafts
- Large power-plant forgings
Advantages
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
- High strength — 720 MPa (104 ksi), better than 82% of steel grades
Limitations
- Limited formability — 20/100, worse than 80% of steel grades
28NiCrMoV8-5 properties
Typical room-temperature values for 28NiCrMoV8-5-+QT800; bars are the position among steel grades.
Physical3
28NiCrMoV8-5 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
28NiCrMoV8-5 has a yield strength of 720 MPa (104 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 82% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
28NiCrMoV8-5 is rated for continuous service to 400°C (752 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 73% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
28NiCrMoV8-5 conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of 28NiCrMoV8-5 takes about 34 MJ of energy and emits 2.4 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 25%.
Manufacturability6
28NiCrMoV8-5's machinability is fair (45/100, worse than 65% of steel grades); weldability poor (30/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 28NiCrMoV8-5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 28NiCrMoV8-5
Is 28NiCrMoV8-5 easy to machine?
Rough machine in the annealed condition; in Q&T (250–300 HB) use rigid setups, coated carbide, 60–110 m/min turning with generous coolant, and stress-relieve before finish grinding.
Can 28NiCrMoV8-5 be welded?
Poor weldability (CE > 0.9) — restrict to repair welds with low-hydrogen consumables, 250–350 °C preheat/interpass and 580–620 °C PWHT below the tempering temperature.
Can 28NiCrMoV8-5 be formed, bent or molded?
Hot forge 1100–1200 °C with slow controlled cooling to avoid flakes; cold forming is not practical, and hydrogen-removal / de-gassing treatments are mandatory for heavy forgings.
28NiCrMoV8-5 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | 0.24 – 0.32 | 0.28 |
| Sioften ≤0.10 for low-Si rotor practice | ≤ 0.35 | 0.2 |
| Mn | 0.2 – 0.6 | 0.35 |
| Prestricted to limit temper embrittlement | ≤ 0.02 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 1.1 – 1.5 | 1.3 |
| Ni | 1.8 – 2.2 | 2 |
| Mo | 0.35 – 0.6 | 0.45 |
| V | 0.05 – 0.15 | 0.1 |
| Curesidual | ≤ 0.2 | 0.08 |
| Alresidual, grain refining | ≤ 0.02 | 0.01 |
| Sn+As+Sbtramp elements limited for embrittlement (J-factor / X-factor) | ≤ 0.03 | 0.02 |
| Fe | balance |
What surface finishes work on 28NiCrMoV8-5?
Grind and polish journals to fine finish; protect by phosphating, oil, painting or metal spray — the alloy has no inherent corrosion resistance and does not anodize.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 28NiCrMoV8-5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6932
How much does 28NiCrMoV8-5 cost?
28NiCrMoV8-5 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
28NiCrMoV8-5 — frequently asked
What is 28NiCrMoV8-5 used for?
28NiCrMoV8-5 is typically used for turbine rotors, turbine shafts and large power-plant forgings. In short: heavy-section rotor forging steel; uniform properties through thickness; repair welding only.
What is the yield strength of 28NiCrMoV8-5?
28NiCrMoV8-5 has a typical yield strength of 720 MPa (104 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 82% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 28NiCrMoV8-5 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Rough machine in the annealed condition; in Q&T (250–300 HB) use rigid setups, coated carbide, 60–110 m/min turning with generous coolant, and stress-relieve before finish grinding.
Can 28NiCrMoV8-5 be welded?
Not readily — weldability is rated poor (30/100). Poor weldability (CE > 0.9) — restrict to repair welds with low-hydrogen consumables, 250–350 °C preheat/interpass and 580–620 °C PWHT below the tempering temperature.
What surface finishes work on 28NiCrMoV8-5?
Grind and polish journals to fine finish; protect by phosphating, oil, painting or metal spray — the alloy has no inherent corrosion resistance and does not anodize.
Can 28NiCrMoV8-5 be formed, bent or molded?
Hot forge 1100–1200 °C with slow controlled cooling to avoid flakes; cold forming is not practical, and hydrogen-removal / de-gassing treatments are mandatory for heavy forgings.
What is the maximum service temperature of 28NiCrMoV8-5?
28NiCrMoV8-5 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 28NiCrMoV8-5 cost?
28NiCrMoV8-5 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10250-3 Open die steel forgings for general engineering purposes — Alloy special steels — CEN (2000)
- EN 10083-3 Steels for quenching and tempering — Alloy steels — CEN (2006)
- DIN 17240 / EN 10269 Heat resisting steels for bolting and rotor applications — DIN / CEN (2013)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture (NiCrMoV rotor steels) — ASM International (1996)
- Heavy rotor and shaft forging steel datasheets (Saarschmiede / Böhler / voestalpine class) — producers (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.